Fiat Chrysler Automobiles NV said Wednesday that its U.S. auto sales rose 8.2% in June on strength in its Jeep and Chrysler brands, while robust SUV and truck sales helped Nissan Motor Co. deliver a 13.3% increase in monthly sales.

General Motors Co. said sales slid 3% to 259,353 vehicles in June, hampered by a 45% drop in rental sales. Edmunds.com had forecast a 0.6% decline for GM.

U.S. auto sales have been pushing higher and are on track to deliver one of the strongest years ever.

This week the National Automobile Dealers Association raised its 2015 U.S. auto-sales forecast to 17.2 million vehicles from its earlier forecast of 16.94 million.

A strong labor market, low-interest rates and deals from auto makers continue to fuel the market for new vehicles.

Meanwhile, prices continue to climb. Automotive information provider Kelley Blue Book said transaction prices of new light vehicles in June rose 2.5% from a year earlier to $33,340.

At Ford, an 11.7% increase in utilities sales helped to offset a 4% drop in car sales and a 0.7% decline in truck sales in June. Ford said it is seeing strong momentum for its new vehicles, such as the F-150 and Mustang. Transaction prices for the Ford brand are up $2,700 from a year earlier, while the company has also scaled back incentives.

Despite the overall decline in sales, GM said retail deliveries were up 6.8% in June, driven by stronger Cadillac, GMC and Chevrolet sales. GM said it saw a 33% increase in pickup deliveries for its Chevrolet brand and a 37% increase for the GMC brand.

Fiat Chrysler, which has now posted 63 consecutive months of year-over-year sales gains, said it sold 185,035 units in June, up from 171,086 a year ago. That was slightly below the 186,864 vehicle units Edmunds.com had forecast Fiat Chrysler would sell.

Jeep sales were up 25% to 71,529 vehicles, driven by higher Patriot and Cherokee sales. Fiat Chrysler said it was the brand's best June sales ever.

Chrysler sales jumped 28%, boosted by sales of the Chrysler 200 midsize sedan, which more than doubled over the prior year.

Meanwhile, Nissan said it sold 124,228 vehicles in June, up from 109,643 a year earlier. Edmunds.com had expected Nissan to sell 124,445 vehicles. Truck sales jumped 30.5%, while car sales ticked up 3.3% to 71,557.

Nissan said sales of Nissan-brand crossovers, trucks and SUVs jumped 30.3% to set a June record.

Fiat Chrysler projected total industry sales in the U.S. to be a seasonally adjusted annualized rate of 17.5 million units for June, while General Motors estimated a rate of 17.3 million units.

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